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HMC5883L Digital Compass Library
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nuwanw



Joined: 16 Jan 2015
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PostPosted: Thu Feb 05, 2015 1:50 am     Reply with quote

Yes, but here in Australia. It's nearly 3 degrees behind, can I put -3 for declination value ?
Thank you in advance
nuwanw



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PostPosted: Thu Feb 05, 2015 6:12 pm     Reply with quote

Hi sshahryiar,

Could you please let me know how to convert that 3 degrees to that value , here my issue is when I rotate the compass chip in a small amount , it displays huge angle, for an example, for 20 degree it indicates 60-80 degrees , however it gives the full scale from 0 to 360, I'm stucked and could you please give me a direction?

Thank you
nuwanw



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PostPosted: Thu Feb 05, 2015 6:12 pm     Reply with quote

Hi sshahryiar,

Could you please let me know how to convert that 3 degrees to that value. Here my issue is when I rotate the compass chip in a small amount, it displays huge angle, for an example, for 20 degree it indicates 60-80 degrees However it gives the full scale from 0 to 360. I'm stucked and could you please give me a direction?

Thank you
sshahryiar



Joined: 05 May 2010
Posts: 92
Location: Dhaka, Bangladesh

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Magnetic Declination
PostPosted: Fri Feb 06, 2015 10:00 pm     Reply with quote

Find the magnetic declination of your region using this link:
http://www.magnetic-declination.com
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nuwanw



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PostPosted: Fri Feb 06, 2015 10:40 pm     Reply with quote

It's 3 degrees positive east, do I need to convert 3 degrees to radiant ?

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sshahryiar



Joined: 05 May 2010
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PostPosted: Fri Feb 06, 2015 10:50 pm     Reply with quote

yeah....
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nuwanw



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PostPosted: Fri Feb 06, 2015 11:00 pm     Reply with quote

then the radiand value is +0.052359878, but it did not make a considerable difference, what may be the issue?
sshahryiar



Joined: 05 May 2010
Posts: 92
Location: Dhaka, Bangladesh

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Possible Issues
PostPosted: Fri Feb 06, 2015 11:30 pm     Reply with quote

Possible Issues:

1. Disturbance due to nearby metallic or electronic object(s)....
2. Tilting.... This is not a tilt compensated compass module likeHMC6352....
3. Interference from electrical sources generating considerable amount of magnetic disturbance....
4. Poor PCB design layout....
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nuwanw



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PostPosted: Sat Feb 07, 2015 2:51 am     Reply with quote

Ok thanks
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